Thanks for the clarification, Don. I took many many years of classical piano and theory, and was always told, when playing in the key of C, that the dominant that the dominant 7th (within that key) would be the g-B-D-F.   (Had to know that to pass theory exams).   Then when I took popular lessons and I was told that a C 7th is C-D-G-Bb, imagine my confusion.

So I accept that the distinction isn't so much a difference between popular and classical, as it is the difference between calling something a G7th and a "dominant 7th of the key of C.    So, as you say, using the term G dominant 7th does create confusion for a classical musician.

So the distinction between what I'm saying and what you're saying really isn't as 'major' as you seem to be making it.

But what do you call a minor chord with a major 7th added?